关键词: 致乏库蚊, 杀虫剂, 抗性, 半数致死浓度

Abstract: Objective This experiment was carried out to investigate the resistance of Culex pipiens quinquefasciatus Say to eight pestsides and make the corresponding control statics.It was very important to control and prevent Cx.pipiens quinquefasciatus Say.Methods LC₅₀ of eight commercial pesticids were measured on the fourth instar larvae by larva soaked method(recommended by WHO).Results The resistance ratios of Cx.pipiens quinquefasciatus to DDV,Bassa,Acetofenate,Permethrin and Deltamethrin were 3.53,1.58,2.91,8.66,4.67 for Wenzhou;3.50,1.67,1.61,6.69,5.33 for Shaoxing;5.35,3.23,2.59,6.72,2.53 for Quzhou;3.53,3.02,2.75,12.10,4.00 for Jinhua;The resistance ratios of Cx.pipiens quinquefasciatus from different cities to DDV,Bassa,Acetofenate,Permethrin,Deltamethrin,DDT,D-allethrim and beta-cypermethrin were 3.78,3.06,1.54,5.15,9.00,1.25,3.27,2.62 for Huzhou;4.24,3.43,1.27,5.32,11.08,1.27,3.20,2.75 for Jiaxing.Conclusion The results showed that Cx.pipiens quinquefasciatus has developed resistance to the eight tested pestsides,especially to Permethrin and Deltamethrin.